listmonk-mcp-bridge 0.4.16

Production-ready MCP server for Listmonk newsletter and mailing list management

Listmonk MCP Bridge

Connect Listmonk to AI agents so they can safely manage email lists, subscribers, campaigns, test sends, transactional emails, and performance reports.

Documentation: https://mnbro.github.io/listmonk-mcp-bridge/

• Tool list: https://mnbro.github.io/listmonk-mcp-bridge/tools/
• Docker: https://mnbro.github.io/listmonk-mcp-bridge/docker/
• Configuration: https://mnbro.github.io/listmonk-mcp-bridge/configuration/
• MCP clients: https://mnbro.github.io/listmonk-mcp-bridge/mcp-clients/
• API coverage: https://mnbro.github.io/listmonk-mcp-bridge/api-coverage/
• Safeguards: https://mnbro.github.io/listmonk-mcp-bridge/safeguards/

What it does

listmonk-mcp-bridge lets MCP clients work with the Listmonk API through typed tools for subscribers, lists, campaigns, templates, media, analytics, imports, bounces and transactional messages.

It includes runtime confirmations for destructive actions, real email sends and sensitive reads.

Recommended tools for LLM agents / orchestrators

This MCP remains a generic Listmonk domain MCP. It does not orchestrate external systems, call other MCP servers, or hardcode external workflows. For full tool behavior and schemas, use the tool documentation and safeguards documentation.

Recommended for autonomous LLM/orchestrator use:

• check_listmonk_health
• get_mailing_lists
• get_list_subscribers_tool
• get_subscriber_context
• audience_summary
• personalization_fields_report
• validate_message_personalization
• campaign_risk_check
• safe_test_campaign
• safe_send_campaign
• safe_schedule_campaign
• safe_send_transactional_email
• campaign_performance_summary
• export_campaign_markdown
• export_campaign_postmortem_markdown
• export_engagement_events
• export_subscriber_communication_summary
• upsert_subscriber_profiles with dryRun=true before any non-dry-run execution

These tools are LLM-friendly because they return compact summaries, warnings and blockers; use guardrails for confirmations, risk checks, approvals and idempotency where relevant; avoid accidental sends; and are suitable building blocks for external business orchestrators.

Supervised / low-level only:

• send_campaign
• test_campaign
• schedule_campaign
• send_transactional_email
• add_subscriber
• update_subscriber
• change_subscriber_status
• manage_subscriber_lists
• manage_subscriber_lists_by_query
• delete_subscribers_by_query
• blocklist_subscriber
• blocklist_subscribers
• blocklist_subscribers_by_query
• remove_subscriber
• remove_subscribers
• create_campaign
• update_campaign
• update_campaign_status
• archive_campaign
• convert_campaign_content
• replace_in_campaign_body
• regex_replace_in_campaign_body
• batch_replace_in_campaign_body
• create_template
• update_template
• delete_template
• set_default_template
• create_mailing_list
• update_mailing_list
• delete_mailing_list
• delete_mailing_lists
• import_subscribers
• upload_media_file
• rename_media
• delete_media_file
• update_settings
• reload_app

Some low-level tools have confirmation guards, but they are still closer to the raw Listmonk API. Prefer safe_* wrappers for LLM workflows. For content changes, preview and risk-check before mutating operations.

Recommended workflows

Campaign flow: check_listmonk_health -> audience_summary -> personalization_fields_report -> validate_message_personalization -> campaign_risk_check -> get_campaign_html_preview or export_campaign_markdown -> safe_test_campaign -> external approval if required -> safe_schedule_campaign or safe_send_campaign -> campaign_performance_summary -> export_campaign_postmortem_markdown.

Do not use send_campaign directly in an orchestrator. Do not use schedule_campaign directly unless there is an explicit low-level reason. Prefer safe_test_campaign before safe_send_campaign; when safe_send_campaign uses requireTestSend=true, provide testRecipients.

Transactional email flow: get_subscriber_context -> validate_message_personalization if subject/body are generated -> safe_send_transactional_email with confirmSend=false for a safety check -> safe_send_transactional_email with confirmSend=true only after an explicit decision. Use an idempotencyKey for recurring events, for example birthday-email:{subscriberId}:{year}.

Transactional data accepts object | null and may contain nested JSON. Some connector renderers show only example fields such as name and customMessage, but the schema keeps additionalProperties=true, so arbitrary template variables are allowed.

Subscriber sync flow: get_subscriber_context by email -> upsert_subscriber_profiles with dryRun=true -> inspect plannedCreated, plannedUpdated and errors -> run upsert_subscriber_profiles with dryRun=false only after external confirmation.

upsert_subscriber_profiles looks up subscribers by email. It needs the relevant Listmonk subscriber permissions, including subscribers:sql_query if SQL lookup is used. Email literals are quoted safely, including apostrophes. In production, use dryRun=true before any write.

Production safety model

• Sensitive read tools require confirm_read.
• Send tools require confirm_send.
• Destructive tools require confirm.
• Scheduling tools require confirm_send or confirmSchedule.
• safe_* wrappers are preferred for LLM agents.
• Approval metadata can block send/schedule even when confirmation is true.
• idempotencyKey prevents duplicate transactional email sends.
• Safe confirmed operations return an auditId.

License

This project is licensed under the PolyForm Internal Use License 1.0.0.

You may use and modify it for your own internal business operations, including commercial internal use. You may not redistribute it, resell it, sublicense it, or offer it as a productized service to third parties.

Install

Run directly with uvx:

uvx listmonk-mcp-bridge

Or install with pip:

pip install listmonk-mcp-bridge
listmonk-mcp-bridge

Configure

Required environment variables:

export LISTMONK_MCP_URL=https://listmonk.example.com
export LISTMONK_MCP_USERNAME=api-user
export LISTMONK_MCP_PASSWORD=your-api-token

Use a dedicated Listmonk API user and token. Do not use the default admin account in production.

MCP client config

{
  "mcpServers": {
    "listmonk-mcp-bridge": {
      "command": "uvx",
      "args": ["listmonk-mcp-bridge"],
      "env": {
        "LISTMONK_MCP_URL": "https://listmonk.example.com",
        "LISTMONK_MCP_USERNAME": "api-user",
        "LISTMONK_MCP_PASSWORD": "your-api-token"
      }
    }
  }
}

Docker

The Debian slim based container image is published to GitHub Container Registry:

docker run --rm -i \
  --env LISTMONK_MCP_URL=https://listmonk.example.com \
  --env LISTMONK_MCP_USERNAME \
  --env LISTMONK_MCP_PASSWORD \
  ghcr.io/mnbro/listmonk-mcp-bridge:latest

See the Docker documentation for MCP client configuration.

Development

uv sync --all-extras
uv run ruff check .
uv run pytest
uv run python -m mypy src tests
uv run mkdocs build --strict

Full setup, tool behavior, API coverage, client-specific configuration and security notes are in the documentation site.